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    "g(Sustainable growth rate ）\n",
    "为可持续增长率恒定的几点推论\n",
    "$$g = ROE * b $$\n",
    "如果g恒定，ROE 与 b 也恒定\n",
    "\n"
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    "补充PRAT\n",
    "\n",
    "【P】Profit Margin 【R】Retention rate【A】Asset turnover rate【T】?Total Financial Leverage\n",
    "\n",
    "$$g = 1 * ROE * b $$ <br>\n",
    "$$g = \\frac{NI}{Sales} * \\frac{Sales}{Assets} * \\frac{Assets}{Equity} * \\frac{NI-D}{NI} $$\n",
    "\n",
    "$$P0 = \\frac{D_1}{r-g} $$\n",
    "$$P1 = \\frac{D_1 *(1+g)}{r-g} $$"
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